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Subject[PATCH v2 1/3] dmaengine: Add support for new feature CRC32C computations
Date
From: Rameshwar Prasad Sahu <rsahu@apm.com>

This patch adds support for new feature CRC32C computations in
dmaengine framework.

Signed-of-by: Rameshwar Prasad Sahu<rsahu@apm.com>
---
Documentation/dmaengine/provider.txt | 3 +++
drivers/dma/dmaengine.c | 2 ++
include/linux/dmaengine.h | 13 +++++++++++++
3 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/Documentation/dmaengine/provider.txt b/Documentation/dmaengine/provider.txt
index 67d4ce4..2399d6f 100644
--- a/Documentation/dmaengine/provider.txt
+++ b/Documentation/dmaengine/provider.txt
@@ -224,6 +224,9 @@ Currently, the types available are:
want to transfer a portion of uncompressed data directly to the
display to print it

+ * DMA_CRC32C
+ - The device is able to perform CRC32C computations
+
These various types will also affect how the source and destination
addresses change over time.

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 09479d4..8cd0365 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -865,6 +865,8 @@ int dma_async_device_register(struct dma_device *device)
!device->device_prep_dma_cyclic);
BUG_ON(dma_has_cap(DMA_INTERLEAVE, device->cap_mask) &&
!device->device_prep_interleaved_dma);
+ BUG_ON(dma_has_cap(DMA_CRC32C, device->cap_mask) &&
+ !device->device_prep_dma_crc32c);

BUG_ON(!device->device_tx_status);
BUG_ON(!device->device_issue_pending);
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 7ea9184..7108d7c 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -74,6 +74,7 @@ enum dma_transaction_type {
DMA_SLAVE,
DMA_CYCLIC,
DMA_INTERLEAVE,
+ DMA_CRC32C,
/* last transaction type for creation of the capabilities mask */
DMA_TX_TYPE_END,
};
@@ -645,6 +646,7 @@ enum dmaengine_alignment {
* The function takes a buffer of size buf_len. The callback function will
* be called after period_len bytes have been transferred.
* @device_prep_interleaved_dma: Transfer expression in a generic way.
+ * @device_prep_dma_crc32c: prepares a crc32c operation
* @device_config: Pushes a new configuration to a channel, return 0 or an error
* code
* @device_pause: Pauses any transfer happening on a channel. Returns
@@ -727,6 +729,9 @@ struct dma_device {
struct dma_async_tx_descriptor *(*device_prep_interleaved_dma)(
struct dma_chan *chan, struct dma_interleaved_template *xt,
unsigned long flags);
+ struct dma_async_tx_descriptor *(*device_prep_dma_crc32c)(
+ struct dma_chan *chan, struct scatterlist *src_sg, size_t len,
+ unsigned int seed, u8 *result, unsigned long flags);

int (*device_config)(struct dma_chan *chan,
struct dma_slave_config *config);
@@ -824,6 +829,14 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_sg(
src_sg, src_nents, flags);
}

+static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_crc3c(
+ struct dma_chan *chan, struct scatterlist *src_sg,
+ size_t len, unsigned int seed, u8 *result, unsigned long flags)
+{
+ return chan->device->device_prep_dma_crc32c(chan, src_sg, len,
+ seed, result, flags);
+}
+
static inline int dmaengine_terminate_all(struct dma_chan *chan)
{
if (chan->device->device_terminate_all)
--
1.7.1

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